1Valkyrie
In Thor: Ragnarok, the carcass that Valkyrie lands on is a bilgesnipe, a creature described by Thor in The Avengers.
2Pepper Potts
In The Avengers (2012), Pepper Potts is barefoot in stark tower whilst Tony Stark wears shoes. This was done to mitigate the height difference between Gwyneth Paltrow and Robert Downey Jr.
3Shuri
In Black Panther, Shuri asks which side of the road should she drive on due to her education in England as England drive left and most of the countries drive right.
4Hela
Thor Ragnarök: Hela's bruises disappear once she reaches Asgard, along with the cracks on her skin. Previously it is mentioned that her power increases when she's on Asgard.
5Aunt May
In Spider-Man: Homecoming, Aunt May is reading ‘The Woman in the Dunes’ by Kobo Abe - which is about an entomologist who gets caught like an insect - at a time in the plot where Peter Parker is almost ‘caught’ as Spider-Man.
6Ghost
In Ant-Man and The Wasp (2018) Ghost makes the motion of opening the double doors as she ghosts through them.
7Queen Frigga
In Thor (2011), Queen Frigga is visibly uncomfortable when Odin states that Thor is his firstborn child. In Thor: Ragnarok (2017) we learn that Odin’s and Frigga’s firstborn was Hela.
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8Agent 13
When first introduced to Kate (a.k.a. Agent 13) in Captain America: The Winter Soldier she hangs up the phone and says to Steve she was on the phone to her aunt, who is kind of an insomniac. It is then revealed in Civil War that Kate is the niece of Peggy Carter.
9Nakia
During the casino brawl scene in "Black Panther," Nakia uses her high heels as a weapon. Later on, during the car chase scene, she is shown to be driving without her shoes
10Mantis
In Guardians of the Galaxy Vol. 2 (2017) Mantis states that Ego found her orphaned on her home planet. When the Ego is talking about The Expansion Ego can be seen with someone from the same race as Mantis as he was likely visiting trying to sire a child.
